CVE-2026-43512 Apache Tomcat: Digest authenticator will authenticate any unknown user
Attackers can bypass authentication in Apache Tomcat digest authentication to access protected resources as unknown users.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-43512?
CVE-2026-43512 is a critical authentication bypass vulnerability in Apache Tomcat, published on 12 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
DEPRECATED: Authentication Bypass Issues vulnerability in digest authentication in Apache Tomcat.
This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.21, from 10.1.0-M1 through 10.1.54, from 9.0.0.M1 through 9.0.117, from 8.5.0 through 8.5.100, from before 7.0.0. Older unsupported versions any also be affect
Users are recommended to upgrade to version 11.0.22, 10.1.55 or 9.0.118 which fix the issue.
Weakness: CWE-592
Which versions are affected by CVE-2026-43512?
19 open source packages ship an affected version, including org.apache.tomcat.embed:tomcat-embed-core, tomcat and org.apache.tomcat:tomcat. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.apache.tomcat.embed:tomcat-embed-core Maven | All versions | 9.0.118 |
org.apache.tomcat.embed:tomcat-embed-core Maven | All versions | 9.0.118 |
org.apache.tomcat.embed:tomcat-embed-core Maven | From 10.1.0-M1 | 10.1.55 |
org.apache.tomcat.embed:tomcat-embed-core Maven | From 10.1.0-M1 | 10.1.55 |
org.apache.tomcat.embed:tomcat-embed-core Maven | From 11.0.0-M1 | 11.0.22 |
org.apache.tomcat.embed:tomcat-embed-core Maven | From 11.0.0-M1 | 11.0.22 |
13 more packages
tomcat Bitnami | From 10.0.0 | 10.1.55, 11.0.22, 9.0.118 |
org.apache.tomcat:tomcat Maven | All versions | 9.0.118 |
org.apache.tomcat:tomcat Maven | All versions | 9.0.118 |
org.apache.tomcat:tomcat Maven | From 10.1.0-M1 | 10.1.55 |
org.apache.tomcat:tomcat Maven | From 10.1.0-M1 | 10.1.55 |
org.apache.tomcat:tomcat Maven | From 11.0.0-M1 | 11.0.22 |
org.apache.tomcat:tomcat Maven | From 11.0.0-M1 | 11.0.22 |
org.apache.tomcat:tomcat-catalina Maven | All versions | 9.0.118 |
org.apache.tomcat:tomcat-catalina Maven | All versions | 9.0.118 |
org.apache.tomcat:tomcat-catalina Maven | From 10.1.0-M1 | 10.1.55 |
org.apache.tomcat:tomcat-catalina Maven | From 10.1.0-M1 | 10.1.55 |
org.apache.tomcat:tomcat-catalina Maven | From 11.0.0-M1 | 11.0.22 |
org.apache.tomcat:tomcat-catalina Maven | From 11.0.0-M1 | 11.0.22 |
Products include Apache Tomcat.
How do I fix CVE-2026-43512?
Upgrade org.apache.tomcat.embed:tomcat-embed-core to a fixed version for your release line: 9.0.118, 10.1.55 or 11.0.22.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-43512 being exploited?
There is no known exploitation of CVE-2026-43512 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in Apache Tomcat
Sources
Also known as BIT-tomcat-2026-43512, CLEANSTART-2026-GH02033, CLEANSTART-2026-OD91042, CLSA-2026-1793136846, DEBIAN-CVE-2026-43512, GHSA-h6fc-48rj-7qqh and 5 more.